CVE-2022-49065Network attack vector

Remote kernel crash via deferred-request tracepoint

Published Feb 26, 2025 · Updated Aug 5, 2026

NULL pointer dereference in SUNRPC tracing in Linux allows remote attackers to crash an NFS server through RPC traffic. The svc_deferred_event TP_fast_assign path dereferences dr->xprt for a remote address after svc_revisit() has set that pointer to NULL. The path requires nfsd or lockd traffic that causes a deferred request while sunrpc svc_defer trace events are enabled, resulting in an oops or panic without data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in SUNRPC tracing in Linux allows remote attackers to crash an NFS server through RPC traffic. The svc_deferred_event TP_fast_assign path dereferences dr->xprt for a remote address after svc_revisit() has set that pointer to NULL. The path requires nfsd or lockd traffic that causes a deferred request while sunrpc svc_defer trace events are enabled, resulting in an oops or panic without data disclosure or modification.

The record

CVE
CVE-2022-49065
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.17
  2. Affected versionversion=ece200ddd54b9ce840cfee554fb812560c545c7d <4d5004451ab2218eab94a30e1841462c9316ba19
  3. Affected versionversion=ece200ddd54b9ce840cfee554fb812560c545c7d <726ae7300fcc25fefa46d188cc07eb16dc908f9e
  4. Affected versionversion=ece200ddd54b9ce840cfee554fb812560c545c7d <85ee17ca21cf92989e8c923e3ea4514c291e9d38
  5. Affected versionversion=ece200ddd54b9ce840cfee554fb812560c545c7d <c2456f470eea3bd06574d988bf6089e7c3f4c5cc

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=ece200ddd54b9ce840cfee554fb812560c545c7d <4d5004451ab2218eab94a30e1841462c9316ba19; version=ece200ddd54b9ce840cfee554fb812560c545c7d <726ae7300fcc25fefa46d188cc07eb16dc908f9e; version=ece200ddd54b9ce840cfee554fb812560c545c7d <85ee17ca21cf92989e8c923e3ea4514c291e9d38; version=ece200ddd54b9ce840cfee554fb812560c545c7d <c2456f470eea3bd06574d988bf6089e7c3f4c5cc

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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